Convert third_party source sets to static libraries.

third_party/libXNVCtrl/BUILD.gn

Index: third_party/libXNVCtrl/BUILD.gn
diff --git a/third_party/libXNVCtrl/BUILD.gn b/third_party/libXNVCtrl/BUILD.gn
index 949401a2367c9592568687efbb6802ac152f63ae..a22493d669f87b7985e2708099ee105e2e0f5b8a 100644
--- a/third_party/libXNVCtrl/BUILD.gn
+++ b/third_party/libXNVCtrl/BUILD.gn
@@ -8,12 +8,10 @@ config("libXNVCtrl_config") {
   # This will build under most configurations with this warning enabled, but
   # some older system headers are missing a "const" on the third parameter of
   # XextAddDisplay which will cause a failure.
-  cflags = [
-    "-Wno-incompatible-pointer-types-discards-qualifiers",
-  ]
+  cflags = [ "-Wno-incompatible-pointer-types-discards-qualifiers" ]
 }
 
-source_set("libXNVCtrl") {
+static_library("libXNVCtrl") {
   sources = [
     "NVCtrl.c",
     "NVCtrl.h",